modularize

diff.py

@@ -0,0 +1,42 @@
+import csv
+
+def read_csv_to_dict(filename):
+    d = {}
+    with open(filename, newline='', encoding='utf-8') as f:
+        reader = csv.DictReader(f)
+        for row in reader:
+            d[row["Artist Name"]] = row
+    return d
+
+def detect_changes(old_data, new_data):
+    changes = []
+
+    old_keys = set(old_data.keys())
+    new_keys = set(new_data.keys())
+
+    removed = old_keys - new_keys
+    added = new_keys - old_keys
+    common = old_keys & new_keys
+
+    for artist in removed:
+        changes.append(f"❌ Removed: **{artist}**")
+
+    for artist in added:
+        changes.append(f"➕ Added: **{artist}**")
+
+    for artist in common:
+        old_row = old_data[artist]
+        new_row = new_data[artist]
+
+        if old_row["URL"] != new_row["URL"]:
+            changes.append(f"🔗 Link changed for **{artist}**")
+        if old_row["Credit"] != new_row["Credit"]:
+            changes.append(f"✏️ Credit changed for **{artist}**")
+        if old_row["Links Work"] != new_row["Links Work"]:
+            changes.append(f"🔄 Links Work status changed for **{artist}**")
+        if old_row["Updated"] != new_row["Updated"]:
+            changes.append(f"🕒 Updated date changed for **{artist}**")
+        if old_row["Best"] != new_row["Best"]:
+            changes.append(f"⭐ Best flag changed for **{artist}**")
+
+    return changes